单项选择题

A life preserver or buoyant work vest is required to be worn on a ship when a person is （）.

A.working on the rig floor
B.working over water
C.working on the pipe racks
D.operating line throwing equipment

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单项选择题
A latitude line will be obtained by observing a body （）.

A.on the prime vertical
B.on the celestial horizon
C.at lower transit
D.on the Greenwich meridian
单项选择题
A lashing used to secure two barges side by side，lashed in an X fashion，is called a （）.

A.quarter line
B.back line
C.peg line
D.jockey line
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